<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        #box {
            width: 100px;
            height: 100px;
            background-color: red;
        }
    </style>
</head>

<body>
    <div id="box">

    </div>
    <script>
        const oBox = document.getElementById('box');

        function center(e) {
            //核心代码
            console.log("center");
            console.log(e);
            console.log(this);
        }

        oBox.onmousemove = throttle(center, 200);

        function throttle(fn, time) {
            let lastTime = 0;
            return function (e) {
                let nowTime = Date.now();
                if (nowTime - lastTime < time) {
                    return;
                }
                lastTime = nowTime;

                fn.call(this, e);
            }
        }
    </script>
</body>

</html>